# Which number is not a perfect square a.5,329 b.1,280 c.3,600 d.729?

##### 2 Answers

Jul 5, 2015

#### Explanation:

Of course you could use your calculator to find out, but in this case it can be done faster.

A square can never end in an odd number of zeroes. A zero at the end points to a factor

BTW: this does **not** mean that every number ending in two zeroes is a square!

Jul 5, 2015

b.

#### Explanation:

a.

b.

c.

d.